Collapse may easily happen during the hole-drilling of the ultra-long bored cast-in-situ piles, which influences the pile-hole making, the quality of underwater concrete, the drilling speed as well as the construction cost. On account of Pier A's foundation of the Maocaojie Bridge, the paper deals with the construction methods for smooth boring, pile-hole collapse prevention and quality guarantee of concrete placement, on condition of the complicated geological environment. By virtue of the force analysis of the hole wall and the Mohr-Coulomb failure criteria, the research proposes the concept of the minimum depth for the pile hole and illustrates the accuracy of this concept, which may supports similar construction.
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